SLUS658D July   2005  – June 2019 TPS40190

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Application Diagram
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Dissipation Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Electrical Characteristics
    5. 6.5 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Internally Fixed Parameters
      2. 7.3.2 Output Short Circuit Protection
      3. 7.3.3 Enable Functionality
      4. 7.3.4 5-V Regulator
      5. 7.3.5 Startup Sequence and Timing
      6. 7.3.6 Prebias Outputs
  8. 8 Application and Implementation
    1. 8.1 Typical Applications
  9. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Community Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  10. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DRC|10
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.5 Startup Sequence and Timing

The TPS40190 startup sequence is as follows. After input power is applied, the 5-V onboard regulator comes up. Once this regulator comes up, the TPS40190 goes through a period where it samples the impedance at the COMP pin and decides the short circuit protection threshold voltage. This is accomplished by placing 400 mV on the COMP pin for approximately 2 ms. During this time, the current is measured and compared against internal thresholds to select the short circuit protection threshold. After this, the COMP pin is brought low for 4 ms. This ensures that the feedback loop is preconditioned at startup and no sudden output rise occurs at the output of the converter when the converter is allowed to start switching. After these initial 6 milliseconds, the internal soft-start circuitry is engaged and the converter is allowed to start. See Figure 27.